As the Channel Tunnel’s 25th anniversary collides with Brexit, meet the teams behind the scenes and beneath the seabed who keep everything on track through the longest undersea tunnel in the world.
With up to 400 trains a day running on its 62 miles of track, the channel tunnel is the busiest railway system in the world - and doing things at the double is key to its success.
With the 25th anniversary well under way, there is some extreme painting going on at both ends of the tunnel - two giant murals that will somehow link to each other across the sea.
After 25 years, Eurotunnel is at a junction, with many staff facing retirement and new recruits being drafted in. The next batch of wannabe shuttle drivers has arrived for the first round of testing.
